Radak families are mainly Croats and they are mostly from Trogir area , barely Hungarians and Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Split. In Goriš in Sibenik every sixth inhabitant had the family name Radak.
Prevalence
About 180 people with faimily name Radak live in Croatia today, in 80 households. There were 120 of them in the middle of the past century, and their number increased by 50 percent. They are located in the most of Croatian counties, in 20 cities and 26 other places, mostly in Sibenik (30), Split (20), Zagreb (15), Cepin in Osijek area (10), and in Goris (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.